Hello everyone.
The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
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Launching a MixedReality immersive headset app. Can Someone Help?
Can someone suggest me how to launch a Mixed Reality App for immersive devices(Acer , HP) from APPX App package which i also successfully installed but when launching just running in window mode but not in immersive mode. Please you can check the screenshot for reference. 
what would be the issue , is there any guidelines?
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Answers
Is this a Unity app?
In Player Settings, you need to make sure that Virtual Reality Supported is checked.
In recent Unity 2017.2.* builds, you can find this under XR Settings.
@timg Yes Virtual Reality supported is already checked.
I've found the solution BTW It seems after updating the window insider program it is working in immersive mode.
Thanks for your time.